RE: Root level mismatch after sudden shutdown

BERGUE Kevin
2022-02-10T08:44:18Z

[-- Attachment #1: Type: text/plain, Size: 7725 bytes --]

>> Hello everyone.
>>
>>
>> After a sudden shutdown my btrfs partition seems to be corrupted. After a few hours of reading documentation and trying various repair methods I found an error message I can't find anywhere so I'm sending it your way hoping you can at least explain what the issue is. The disk was running with linux 5.16.5 at the moment of the crash, my recovery environnement is a linux 5.15.16 machine with btrfs-progs v5.16.
>>
>>
>> To retrace my steps a bit:
>>
>> - I tried to mount my partition normally:
>> # mount /dev/mapper/SSD-Root /mnt/broken/
>> mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
>>
>> - I then looked at the relevant logs from dmesg:
>> # dmesg
>> [ 2118.381387] BTRFS info (device dm-1): flagging fs with big metadata feature
>> [ 2118.381394] BTRFS info (device dm-1): disk space caching is enabled
>> [ 2118.381395] BTRFS info (device dm-1): has skinny extents
>> [ 2118.384626] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2118.384900] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2118.384905] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
>> [ 2118.385304] BTRFS error (device dm-1): open_ctree failed
>>
>> - After some reading about the "parent transid verify failed" errors I tried to mount the volume with the usebackuproot flag:
>> # mount -t btrfs -o ro,rescue=usebackuproot /dev/mapper/SSD-Root /mnt/broken/
>> mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
>> And the dmesg content:
>> [ 2442.117867] BTRFS info (device dm-1): flagging fs with big metadata feature
>> [ 2442.117871] BTRFS info (device dm-1): trying to use backup root at mount time
>> [ 2442.117872] BTRFS info (device dm-1): disk space caching is enabled
>> [ 2442.117873] BTRFS info (device dm-1): has skinny extents
>> [ 2442.123056] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2442.123344] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2442.123348] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
>> [ 2442.124743] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2442.124939] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2442.124942] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
>> [ 2442.125196] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
>> [ 2442.125201] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
>> [ 2442.125500] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
>> [ 2442.125502] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
>> [ 2442.125508] BTRFS warning (device dm-1): couldn't read tree root
>> [ 2442.125806] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
>> [ 2442.125808] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
>> [ 2442.126174] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
>> [ 2442.126175] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
>> [ 2442.126184] BTRFS warning (device dm-1): couldn't read tree root
>> [ 2442.126599] BTRFS error (device dm-1): open_ctree failed
>
>What do you get for uname -a? What are the mount options? In
>particular I'm wondering if this drive is subject to discards, which
>currently will render usebackuproots useless. And how old is the file
>system?

$ uname -a
Linux Elysium 5.16.5-1-MANJARO #1 SMP PREEMPT Tue Feb 1 16:57:14 UTC 2022 x86_64 GNU/Linux

The mount options I used were probably "rw,noatime,compress=zstd,ssd,space_cache,commit=120,subvol=@" since that's what I usually use but I can't be sure since fstab is on the disk.

Again, can't know for sure but from the top of my head I'd say I created it 6 months ago? It was probably created with linux 5.10 since that would have been the latest LTS.

>
>If ro,rescue=usebackuproot doesn't work, it's not likely repairable,
>but might still be something btrfs restore can scrape *if* you haven't
>tried any repairs first. Repairs write changes to disk and can make
>things worse and harder to recover. You pretty much have to go
>straight to the scrape data off the drive step before the repair step
>because it is lower risk and more reliable.
>
>The central problem is some lower layer mishandled write order, most
>likely by dropping flush/FUA, i.e. confirming to btrfs that flush/FUA
>command succeeded when in fact critical metadata has not yet made it
>to persistent media. And there is no way for Btrfs to know this until
>it's too late.

Yeah, that was my guess too.

>>
>> - I then tried a check:
>> # btrfs check /dev/mapper/SSD-Root
>> Opening filesystem to check...
>> parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> Ignoring transid failure
>> ERROR: root [4 0] level 0 does not match 1
>
>What do you get for
>
>btrfs rescue super -v $dev
All Devices:
Device: id = 1, name = /dev/mapper/SSD-Root

Before Recovering:
[All good supers]:
device name = /dev/mapper/SSD-Root
superblock bytenr = 65536

device name = /dev/mapper/SSD-Root
superblock bytenr = 67108864

device name = /dev/mapper/SSD-Root
superblock bytenr = 274877906944

[All bad supers]:

All supers are valid, no need to recover

>btrfs insp dump-s -f $dev
see attached "dump-s" file

>btrfs insp dump-t -b 1869491683328 $dev
see attached "dump-t -b 1869491683328" file

>btrfs insp dump-t -b 1869863370752 $dev
see attached "dump-t -b 1869863370752" file

>btrfs insp dump-t -b 1869866401792 $dev
see attached "dump-t -b 1869866401792" file

>
>
>
>>
>> Couldn't setup device tree
>> ERROR: cannot open file system
>>
>>
>> I think the "root [4 0] level 0 does not match 1" error is the real cuprit but I can't seem to find any info on this message anywhere. I tried a bunch of other commands including:
>> - btrfs rescue zero-log
>> - btrfs rescue chunk-recover
>> - btrfs check --repair
>> - btrfs rescue super-recover
>> - btrfs check --repair with the tree root found by btrfs-find-root
>> - btrfs check --repair --init-csum-tree --init-extent-tree
>> - btrfs restore
>>
>> I'm aware I probably executed some commands that don't make a lot of sense in my context but all of them failed with either the "root [4 0] level 0 does not match 1" message or a more generic "could not open ctree" or equivalent.
>
>--repair, but especially --init-extent-tree can make it next to
>impossible for 'btrfs restore' command to work. It's not obvious that
>trying to fix btrfs, can make it harder for the scrape tool to work.
>
>
>
>--
>Chris Murphy

[-- Attachment #2: dump-t -b 1869866401792 --]
[-- Type: application/octet-stream, Size: 37875 bytes --]

btrfs-progs v5.16
parent transid verify failed on 1869491683328 wanted 526959 found 526999
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[-- Attachment #3: dump-t -b 1869863370752 --]
[-- Type: application/octet-stream, Size: 34716 bytes --]

btrfs-progs v5.16
parent transid verify failed on 1869491683328 wanted 526959 found 526999
parent transid verify failed on 1869491683328 wanted 526959 found 526999
Couldn't setup device tree
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[-- Attachment #4: dump-t -b 1869491683328 --]
[-- Type: application/octet-stream, Size: 37812 bytes --]

btrfs-progs v5.16
parent transid verify failed on 1869491683328 wanted 526959 found 526999
parent transid verify failed on 1869491683328 wanted 526959 found 526999
Couldn't setup device tree
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[-- Attachment #5: dump-s --]
[-- Type: application/octet-stream, Size: 3422 bytes --]

superblock: bytenr=65536, device=/dev/mapper/SSD-Root
---------------------------------------------------------
csum_type 0 (crc32c)
csum_size 4
csum 0x11012b42 [match]
bytenr 65536
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid f3801f99-7d52-40d1-942a-21694a73d70a
metadata_uuid f3801f99-7d52-40d1-942a-21694a73d70a
label
generation 527003
root 1869867565056
sys_array_size 129
chunk_root_generation 508001
root_level 1
chunk_root 1871629516800
chunk_root_level 1
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 942489468928
bytes_used 773380874240
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 1
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x151
( MIXED_BACKREF |
COMPRESS_ZSTD |
EXTENDED_IREF |
SKINNY_METADATA )
cache_generation 527003
uuid_tree_generation 527003
dev_item.uuid 5b27a79a-569e-4aa8-bfde-2a66c4485d0c
dev_item.fsid f3801f99-7d52-40d1-942a-21694a73d70a [match]
dev_item.type 0
dev_item.total_bytes 942489468928
dev_item.bytes_used 831143280640
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 1
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
sys_chunk_array[2048]:
item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 1871629516800)
length 33554432 owner 2 stripe_len 65536 type SYSTEM|DUP
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 1
stripe 0 devid 1 offset 82746277888
dev_uuid 5b27a79a-569e-4aa8-bfde-2a66c4485d0c
stripe 1 devid 1 offset 82779832320
dev_uuid 5b27a79a-569e-4aa8-bfde-2a66c4485d0c
backup_roots[4]:
backup 0:
backup_tree_root: 1869866401792 gen: 527001 level: 1
backup_chunk_root: 1871629516800 gen: 508001 level: 1
backup_extent_root: 1869862551552 gen: 527001 level: 2
backup_fs_root: 1869625753600 gen: 526974 level: 1
backup_dev_root: 1869491683328 gen: 526959 level: 1
backup_csum_root: 1869859930112 gen: 527001 level: 2
backup_total_bytes: 942489468928
backup_bytes_used: 773380874240
backup_num_devices: 1

backup 1:
backup_tree_root: 1869863813120 gen: 527002 level: 1
backup_chunk_root: 1871629516800 gen: 508001 level: 1
backup_extent_root: 1869863124992 gen: 527002 level: 2
backup_fs_root: 1869625753600 gen: 526974 level: 1
backup_dev_root: 1869491683328 gen: 526959 level: 1
backup_csum_root: 1869861617664 gen: 527002 level: 2
backup_total_bytes: 942489468928
backup_bytes_used: 773380874240
backup_num_devices: 1

backup 2:
backup_tree_root: 1869867565056 gen: 527003 level: 1
backup_chunk_root: 1871629516800 gen: 508001 level: 1
backup_extent_root: 1869865238528 gen: 527003 level: 2
backup_fs_root: 1869625753600 gen: 526974 level: 1
backup_dev_root: 1869491683328 gen: 526959 level: 1
backup_csum_root: 1869861994496 gen: 527003 level: 2
backup_total_bytes: 942489468928
backup_bytes_used: 773380874240
backup_num_devices: 1

backup 3:
backup_tree_root: 1869863370752 gen: 527000 level: 1
backup_chunk_root: 1871629516800 gen: 508001 level: 1
backup_extent_root: 1869862027264 gen: 527000 level: 2
backup_fs_root: 1869625753600 gen: 526974 level: 1
backup_dev_root: 1869491683328 gen: 526959 level: 1
backup_csum_root: 1869854654464 gen: 527000 level: 2
backup_total_bytes: 942489468928
backup_bytes_used: 773380874240
backup_num_devices: 1